Hey,
I don't know what sample cd's have good guitar licks on them, most of what I've heard aren't very good anyways.
You already have the tools to make your own, this is what we do for our guitar patterns:
We plug an electric guitar into a mixer channel and play for 10-15 minutes at a time, just messing around and finding neat patterns and riffs...while playing, all of it is being recorded into Cool Edit as a big ass wave file.
Then, we drop the wave file into the MT, load up a drum loop on another track and stretch it out, and make cut up cool parts and rearrange them in time with the drums, making new patterns that we never though of playing ourselves or doing stuff that would be impossible to play.
If we're feeling brave, we put some of the riffs in a track that has an echo effect loaded, and other riffs into a dry track, then mix them down together without the drums.
We then open the mixdown in the EV and save out different selections as individual files to load into a sampler or a track in Cubase.
This could be done exclusively in Cubase, but as I'm very quick in CEP, I use it instead.
Take care,
Nick